Naphthalene insect tablet



Patented June 3, 1924.

res PATENT OFFICE.

xosm'cnr Samara, or nmomaasnr-xu, roxyaaaran.

. NAPHTHALENE No Drawing. Application filed July 7,

To all whom it may concern:

Be it known that I, YOSHICHI S HrBA'rA, subject of the Emperor of Japan, res ding at No. 6 Iwatsuki-cho, Nihonbashi-ku, Tokyo,-

, the solution obtained by heating at far lower degree than the melting point of the borneol or' camphor into water through a funnel provided with a plurality of holes. Tablets are then made from these granules after being congealed in water, by being pressed in a tablet-machine.

Ordinary tablets-made by mixing powdered naphthalene with borneol or camphor and a'perfuming material, vaporize very unequally. This is probably due to the fact that the perfume vaporizes much more readily than the other materials; t

In accordance with the present invention, however, the tablets are found to vaporize very uniformly, giving off constantly a mixture of the vapors of-naphtha'lene, perfuming agent and borneol or camphor in approximately the same proportions, in which they are present in the tablets.- This is on account of the very complete and thoroughly intermixing of the ingredients;

The manufacture of these tablets is preferably conducted. by melting naphthalene and heating the same to 120 (3., some perfume being added, together with 10 to 20% or so of borneol or camphor. The borneol or camphor will be found to readily dissolve in the molten mass. Drops of this are allowed to fall into water, and the sudden cooling converts these "drops into granules, which possessa rough exterior and are Weak. Dur

ing this operation the water should be stirred up or should be renewed from time" totime tokeep the same cold.

INSECT TABLET.

1922. Serial no. 573,484.

The following examples are given of the proportions which may be employed Ewample 1.

. Parts. Naphthalene Borneol 10 Perfume essence 5 Example 2. 9

' Parts. Naphthalene 100 .Camphor 15 Perfume essence 5 D These materials are, on account of the mode of preparation combined together very thoroughly and hence each'materia'l is so held in the tablet that it cannot vaporize independently from the other ingredients, but 7' all of the ingredients together vaporize gradually in. about the proportion in which they are mixed in the tablets. The tablets are easily shaped in the tablet-machine from the granules, and it is not necessary to 7:, previously grind up the ingredients.

Although the melting point of borneol is 203 (1., and that of camphor is C, while the melting point of naphthalene is only 79 (1., the aflinity of these substances for each other makes a perfect blend on account of the melting and solution of the borneol or camphor in the molten naphthalene.

The expression a borneol compound is hereinafter used to embrace both borneol itself and camphor.

-I claim: 9

A method'of making naphthalene insect tablets,-containing a perfume, which comprises forming a molten mixture of ii'aphthalene, a borneol compound and a perfume, then running this in the form of smalb masses-into cold water to congeal the same, and then pressing the granules'into tablet 95 form.

In testimony whereof I affix my signature, I

YOSHICHI SHIBATA.

Witness: l

.N. HARASHIMA. 

